[SPARK-6553] [pyspark] Support functools.partial as UDF#5206

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ksonj wants to merge 4 commits intoapache:branch-1.3from

Commits on Mar 26, 2015

support functools.partial as udf
ksonj
committed

Commits on Mar 27, 2015

Makes UDFs work with all types of callables
ksonj
committed

Commits on Mar 30, 2015

added tests for udf with partial function and callable object
ksonj
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Commits on Mar 31, 2015

Inserted blank lines for PEP8 compliance
ksonj
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